Tamper evident adhesive and identification document including same
First Claim
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1. An identification document, comprising:
- an information-bearing layer;
an adhesive layer overlaying at least a portion of the information-bearing layer, the adhesive layer comprising a thermally active low Tg polymeric resin and a multifunctional crystalline polymer;
a protective layer coupled to the information-bearing layer via the adhesive layer;
wherein the adhesive layer is constructed and arranged such that subjecting the identification document to a temperature above a predetermined temperature causes a plurality of crystals to form in the adhesive layer;
wherein the crystal formation is substantially irreversible; and
,wherein the crystals are visible to an unaided human eye.
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Abstract
A composition is provided for adhering a first article to a second article, the composition comprising a thermally active low Tg polymeric resin; and a multifunctional crystalline polymer. The thermally active low Tg polymeric resin can, for example, comprise 50-99% of the composition. The multifunctional crystalline polymer can, for example, comprise 1-50% of the composition. In one embodiment, the multifunctional crystalline polymer comprises 5-20% by weight of the composition. In one embodiment, the multifunctional crystalline polymer has a low molecular weight.
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Citations
10 Claims
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1. An identification document, comprising:
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an information-bearing layer; an adhesive layer overlaying at least a portion of the information-bearing layer, the adhesive layer comprising a thermally active low Tg polymeric resin and a multifunctional crystalline polymer; a protective layer coupled to the information-bearing layer via the adhesive layer; wherein the adhesive layer is constructed and arranged such that subjecting the identification document to a temperature above a predetermined temperature causes a plurality of crystals to form in the adhesive layer; wherein the crystal formation is substantially irreversible; and
,wherein the crystals are visible to an unaided human eye. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification